Database Management Systems Mcqs

Page No. 78

Cross Product is a:


aUnary Operator


bTernary Operator


cBinary Operator


dNot an operator


View Answer Binary Operator

In E-R Diagram derived attribute are represented by


aEllipse


bDashed ellipse


cRectangle


dTriangle


View Answer Dashed ellipse

A primary key is combined with a foreign key creates


aParent-Child relation ship between the tables that connect them.


bMany to many relationship between the tables that connect them.


cNetwork model between the tables that connect them.


dNone of the above.



The physical location of a record is determined by a mathematical formula that transforms a file key into a record location is :


aB-Tree File


bHashed File


cIndexed File


dSequential file


View Answer Hashed File

A file manipulation command that extracts some of the records from a file is called


aSELECT


bPROJECT


cJOIN


dPRODUCT


View Answer SELECT

A data dictionary is a special file that contains:


aThe name of all fields in all files.


bThe width of all fields in all files.


cThe data type of all fields in all files.


dAll of the above.


View Answer All of the above.

NULL is


athe same as 0 for integer


bthe same as blank for character


cthe same as 0 for integer and blank for character


dNot a value


View Answer Not a value

Which of the following is a comparison operator in SQL?


a=


bLIKE


cBetween


dALL


View Answer ALL

The result of the UNION operation between R1 and R2 is a relation that includes


aall the tuples of R1


ball the tuples of R2


call the tuples of R1 and R2


dall the tuples of R1 and R2 which have common columns



Which are the two ways in which entities can participate in a relationship?


aPassive and active


bTotal and partial


cSimple and Complex


dAll of the above


View Answer Total and partial

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